: the story in los angeles is still developing tongiht.at-s-aofficerwas killed -- and three more people are injured, one critically at the los angeles international airport after a man pulled out an assault rifle and opened fire in the screening area.. >> catherine: police say the gunman then ran off toward the gates - with bystanders diving for cover. a witness said at least 100 people came barreling down a terminal stairway. the gunman has been identified as 23-year-old paul see-see-ah. he was arrested after being shot in the chest. witnesses described the scene. >> guide downstairs started shooting. he was heading up near the security check. >> people were screaming and heading into the bathroom. >> worst experience i have ever been. people were going crazy one of the most terrifying experiences i have ever been through! >> children were crying and people were still very shaky >> catherine: a terrifying ordeal for passengers. we're learning the gunman had apparently targeted t-s- a agents. and police say he had a handwritten note in a bag that referenced killing tsa agents and quote